Who's job is it anyway?

I remember having read this in the school magazine while I was in elementary school.

This is a story about four people named Everybody, Somebody, Anybody and Nobody. There was an important job to be done and Everybody was sure that Somebody would do it. Anybody could have done it but Nobody did it. Somebody got angry about that, because it is Everybody's job. Everybody thought Anybody could do it but Nobody realized that Everybody wouldn't do it. In the end, Everybody blamed Somebody when Nobody did what Anybody could have done.